BTW, this doesn't involve anything sent from Authorize.net, but if you want to disable the transaction notification that E-junkie sends to your buyers, you can do this on a per-product basis (unfortunately, there is no blanket way to disable E-junkie buyer notification across the board all at once). In Seller Admin, for each product you don't want to have sending an E-junkie email:
* Edit that product (or Add a new one);
* On the Product Configuration screen, checkmark Enable Templated Email;
* Leave the Email Subject and Email Message boxes blank (it cannot send templated email if there is no subject nor template to send!).
